Given a string s
which represents an expression, evaluate this expression and return its value.
The integer division should truncate toward zero.
Example 1:
Input: s = "3+2*2" Output: 7
Example 2:
Input: s = " 3/2 " Output: 1
Example 3:
Input: s = " 3+5 / 2 " Output: 5
Constraints:
1 <= s.length <= 3 * 105
s
consists of integers and operators('+', '-', '*', '/')
separated by some number of spaces.s
represents a valid expression.- All the integers in the expression are non-negative integers in the range
[0, 231 - 1]
. - The answer is guaranteed to fit in a 32-bit integer.
- Basic Calculator (Hard)
- Expression Add Operators (Hard)
- Basic Calculator III (Hard)